In order to configure the Twitter Widget you need to do the following:

1. Visit http://dev.twitter.com/apps/new
2. Login or make sure to login as Twitter account used on website to display tweets
3. Type the following on input fields:
   Name: [Your Site Name] Twitter Widget
   Description: Display twitter feeds on website
   Website: [Your website URL]
   Callback URL: (leave blank)
4. Check on “Yes, I agree” and fill the CAPTCHA
5. Once the application is setup, copy and paste the application OAuth settings into your Twitter Widget Configuration. (Consumer and Consumer Key)
6. Back on Twitter click “Create my access token”, then copy and paste the recently created Access Token into your widget configuration back on your website.
7. On the Widget Configuration on your website, change the Username name to your Twitter ID without @ symbol. Complete the other fields if necessary (Include Retweets, Exclude Replies & the number of tweets to show).
8. Save the Widget settings.
9. Voilá, your tweets should be displaying by now.